Engine for a model



FIG. 1 is a plan view of an engine for a model in accordance with the present design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is an enlarged sectional view taken along the line 8--8 of FIG. 3; and,

FIG. 9 is an enlarged sectional view taken along the line 9--9 of FIG. 2. 

The ornamental design for an engine for a model, as shown and described. 